824854T11 824854T20 Mercury Carburettor | Genuine Used Part

🔧 Product Description

Genuine Mercury 90HP WME Bottom Carburettor - Part Number: 824854T20

A genuine used Mercury Marine bottom carburettor for selected 90HP three-cylinder, oil-injected two-stroke outboard motors and corresponding 65 Jet applications using the 90HP powerhead.

The original 824854T11 WME-87-3 carburettor was replaced by the updated 824854T20 WME-108-3 assembly. This is the dedicated lower carburettor and is calibrated differently from the upper and centre carburettors used on the same engine.

⚙️ Key Features

• Genuine used Mercury Marine bottom carburettor
• Current OEM part number 824854T20
• Supersedes earlier carburettor 824854T11
• WME-108-3 replacement for WME-87-3
• Specifically calibrated for the lower cylinder pair on 90HP oil-injected engines

🚤 Compatibility

Commonly used on

• Mercury and Mariner 90HP three-cylinder carburettor assemblies
• Oil-injected two-stroke engines using three vertically mounted WME carburettors
• Mercury 65 Jet models using the corresponding 90HP three-cylinder powerhead

Typically suits

• Engine models:
• Mercury 90HP three-cylinder oil-injected two-stroke
• Mariner 90HP three-cylinder oil-injected two-stroke
• Mercury 90 ELPTO
• Mercury 90 EXLPTO
• Mercury 90 ELPTO Saltwater
• Mercury 65 Jet three-cylinder outboard using the 90HP powerhead
• USA serial range approximately 0G760300 through 1B226999
• Belgian serial range approximately 0P017000 through 0P400999
• 2004 Mercury 90 ELPTO model 1090412CB
• Carburettor groups specifying WME-87-3 or WME-108-3 in the lower position
• HP Range: 65 Jet / 90HP
• Engine Type: Mercury / Mariner inline three-cylinder carburetted, oil-injected two-stroke outboard
• Carburettor Position: Bottom / lower carburettor
• Year Range: Approximately 1999-2006

🔌 Function

The bottom carburettor meters the fuel-and-air mixture supplied to the lower cylinder pair. Its float, inlet needle, main jet, idle circuit and throttle plate work with the upper and centre carburettors to provide balanced fuel delivery across the three-cylinder engine.

The lower carburettor must retain the correct 90HP jetting and WME calibration. It should not be substituted with an upper, centre, non-oil-injected or 75HP-calibrated carburettor solely because the external body appears similar.

⚠️ Common Signs of Failure

• Engine is difficult to start
• Lower cylinder operates lean or receives insufficient fuel
• Engine idles unevenly or stalls
• Hesitation or bogging occurs during acceleration
• Engine cannot reach full rated RPM
• Fuel leaks from the bowl or inlet needle
• Spark plug colour differs on the lower cylinder
• Carburettor float sticks or floods the engine
• Main jet or idle passage becomes restricted
• Synchronisation between the three carburettors is incorrect

🔄 Supersession & Cross Reference

OEM Supersession Chain

• 824854T20 → Supersedes 824854T11
• 824854T11 earlier WME-87-3 bottom carburettor
• 824854T20 updated WME-108-3 bottom carburettor

OEM / Related Numbers

• 824854T20
• 3301-824854T20
• 3301824854T20
• 824854T11
• 3301-824854T11
• 3301824854T11
• WME-108-3
• WME-87-3
• 824854T18 related upper WME-108-1 carburettor
• 824854T19 related centre WME-108-2 carburettor
• 824854T9 earlier upper WME-87-1 carburettor
• 824854T10 earlier centre WME-87-2 carburettor
• 824854T29 later WME-115-3 bottom carburettor
• 8236354 carburettor repair kit
• 8112231 carburettor gasket set
• 808738 nozzle-well gasket
• 27-151724 carburettor flange gasket
• 95951 inlet needle valve
• 9594 carburettor float

Aftermarket / Verified Equivalents

• Sierra: 18-7750-1 - carburettor repair kit
• Sierra: 18-7211-1 - carburettor gasket kit
• Sierra: 18-0324 - carburettor flange gasket
• GLM: 40490 - carburettor gasket kit
• Mallory: 9-37303 - carburettor gasket kit
• Recmar: REC1395-8112231 - carburettor service kit
• Aftermarket Replacement: 824854T11 / WME-87-3 bottom carburettor

📦 Condition

• Genuine used part
• Dedicated bottom carburettor assembly
• Removed from running engine where applicable
• In good working condition unless otherwise stated